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Welcome to:

U.S. Naval Forces Southern Command/

U.S. 4th Fleet 

U.S. Naval Forces Southern Command,
U.S. FOURTH Fleet,
PO BOX 280003
Jacksonville, Florida


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Phone: (904) 270-4843

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Commander, U.S. Fourth Fleet (COMFOURTHFLT) is the Numbered Fleet Commander assigned to U.S. Naval Forces Southern Command, exercising operational control of assigned forces. COMFOURTHFLT conducts the full spectrum of Maritime Security Operations (MSO) in support of U.S objectives and security cooperation activities that promote coalition building and deter aggression. COMFOURTHFLT acts in concert with other U.S. Southern Command (USSOUTHCOM) components, coalition forces, and Joint Task Forces to promote peace, stability, and prosperity in the USSOUTHCOM area of focus.


U.S. Naval Forces Southern Command supports U.S. Southern Command joint and combined full-spectrum military operations by providing a sea based, forward presence to ensure freedom of maneuver in the maritime domain, to foster and sustain cooperative relationships with partners and to fully exploit the sea as meneuver space in order to enhance regional security and cooperation.